I was switching through breakers to isolate outlets. I had the panel door open, stepped away, and when I walked back to touch the panel's DOOR, I got a static-like shock on my finger. I was wearing socks & rubbed across carpet before I touched it, so I'm wondering if this was a harmless static shock, or something faulty going on? It came straight from the door-- didn't even have a chance to touch a breaker. Left my hand a bit prickly, so I've been worried.
Like Captain Kirk said when he sensed a trap, "It's never a bad time for a battle-stations drill".
It's never a bad time to go through and thoroughly inspect your Grounding Electrode System to assure it's in good order. You may have gotten blindsided by something like the water company severing your water pipe ground by inserting a plastic smart meter.
What's that cliche "Err on the side of caution" especially if it could be a shock hazard.
From what you are describing, you could be building a static charge on your person by sliding across a carpet and discharging to a grounded object. So the static flow is from you (ungrounded) to the panel(grounded). The way you can find out is to shuffle you feet and see if you can create the situation on another piece of equipment. Use a key or butter knife and as you firmly hold it see if you can create a spark without shocking yourself.
On the other hand you might be getting a shock from the panel (ungrounded) to yourself (grounded). Even though this is highly unlikely, it means you may be dealing with a totally ungrounded electrical system. I don't know if you have the skill set to go through and safely verify if the equipment is properly grounded, but a trained electrician who is skilled and trained to inspect and make repairs may be the route you need to take.
Remember safety is the key. Do not take any chances when dealing with electrical shock.
The metal case of the box is bonded to ground so it is a static discharge. If you reach and touch it again you should now be discharged and nothing will happen. We used to love it when mom bought nylon or rayon socks instead of cotton because they built up the best static, we used to charge up and sneak behind and touch the ear lobe. Lots of fun for brothers that loved to torment each other. Static charges can be tens of thousands of volts but their is almost no current. A really good one will leave the nerves buzzing for a while.
Did you just touch the door for a blink of an eye or were you holding it for longer time (seconds)? Was it a zap or it was your hand itching whole time you touched the door?
- You touched the door for a blink: I can't say, it may be both cases. Do investigate further with multimeter/probe.
- It was a zap: You gained a static charge and when touching grounded door you discharged. This is normal and usually harmless. If it bothers you, change clothing that causes you charging.
- It was a continuous itch: There are several issues with your circuitry:
- There is some contact of hot wire connected to your ground wire - that's why the ground wires got energized.
- The circuit is not properly grounded - that's why the circuit closes through your high-resistance body.
- The whole braker panel etc. is connected to the ground wire only - that's why it can shock you.
If I were I'd measure the AC voltage of the door against proper ground (water piping, heating,...) and see what kind of shock you got.
If it proves it's the third option you are to face shut all your brakers and turn on one at time and look for the branch, that leaks. Check all the devices connected to this branch, replace/repair/get repaired the faulty ones.
Then check all the ground wires properly connected and properly grounded - it seems there might be some loose wire connection.
If in any doubt, do not hesitate calling an electrician it. It is not a shame to call an expert. It's a shame when someone get hurt or house is burned down besause of someone's false expertise.